Earlier quoted context omitted.
Honestly doctors can spread a lot of disinformation on things not biologically related. For example, our pediatrician recommended we wait until 3 to potty train our son... who at the time was already potty trained. Potty training is also something that differs widely between developed nations and rest of world.
> Potty training is also something that differs widely between developed nations and rest of world. And between kids. My daughter just up and decided at around 18 months or so that she was done with diapers and would use the big girl potty. Not one accident. My son was more apathetic about the whole thing, and it was sometime past his third birthday before he finally started using the toilet to poop in. The piece of…
Take for example Vietnam, where kids are out of diapers at around 9 months[1]. Even in the US the age at which children are potty trained has crept up slowly from 1 year to 19 months to 27 months today:
> In the U.S., until the 1950s, most children were using the potty in the first few months of life and completely trained by age 1. In the 1970s, 18 months was an average age to start. Now, it's around 24 to 30 months.[2]
As the article asks, what are the phenomena causing these changes and what explains the huge discrepancies between countries and cultures? Clearly the biology of children does NOT explain the difference.
1. https://www.sciencedaily.com/releases/2013/01/130130082726.h...